In order to make sure that you never get accused of sending spam, it's important to have a deep understanding of it.

Email Marketing Glossary

Blacklist

Blacklists are created lists of IP addresses belonging to organizations that have been identified as senders of SPAM or unsolicited commercial email. Blacklists are often used by ISPs and corporations as part of the filtering process that determines which IP addresses they prohibit from sending mail to their members/users.